WNS Series horizontal Oil-fired (Gas) Boiler
-9-
can be realized through changing the curvature radius.
④
Adjustment for safety valve
The safety valve should be adjusted for first time use, for the detail, can according to the
requirements stipulated on the table 7-2, No. 143 of the standard
《
Safety & Technical
Supervision Regulation for Steam Boiler
》
.
4.1 Safety valve open pressure
Rated steam pressure
Safety valve open pressure
0.7Mpa
0.73Mpa
0.75Mpa
1.0Mpa
1.04Mpa
1.06Mpa
1.25Mpa
1.3Mpa
1.325Mpa
4.2 Safety valve adjustment method
Disassemble the pin, remove top cover, loose the hexagon nut, screw the regulating rod,
make the spring loose or tight and get the required discharging pressure for safety valve. After
finishing adjustment, tight the hexagon nut and the other parts.4.1 All safety valves can
’
t be
moved freely after adjustment.
4.3 All safety valves can
’
t be moved freely after adjustment.
4.4 Do not knock the any part of safety valve. Only use control rod to open safety valve, no
other way.
4.5 It is not permitted to run boiler no calibration for safety valve.
4.6 After calibrated for safety valve, it should be locked or sealed with lead.
⑤
Supply steam
When the steam pressure inside boiler is close to working pressure, can supply steam to
outside. Before supply steam, the water level inside boiler can
’
t be over than normal water
level. While supply steam, should open main steam valve slightly, let a little steam to warm
tube, at the same time open the drain valve on the pipeline and drain condensed water. The
time for warming tube should be according to the length & diameter of pipeline, steam
temperature and so on. In generally, it should not less than ten minutes. After the tube is heated,
open the main steam valve slowly, at the same time note all parts whether have some abnormal
sound. After finishing supply steam, check all fitting parts, valve, instrument once again to see
whether have some abnormal phenomena of water & steam leakage, to see whether all parts are
in normal working condition. In order to avoid water existing inside steam, keep water level
never over than glass board.
⑥
Boiler daily maintenance
In order to insure boiler safely & economical running, should well do daily maintenance.
6.1 Feeding water requirements
It should be make some treatment for boiler feeding water, the water quality should comply
with the regulation of the standard of GB1576
《
Water Quality for Low Pressure Boiler
》
.
6.2 Boiler water level
Pay attention to observe the boiler water level all the time, boiler water level can
’
t be
higher than limit high water level and limit low water level. In general, the water level inside
water level gauge should has some slight shaking, if find the water surface has no any change,
it possibly is plugged, must wash it immediately.
6.3 Water level gauge
Every shift should at least wash water level gauge for one time. If find there is steam or
water leakage, should add packing material. If the glass board is not clear, or the water level
line is not clear, also it is still not good after washing, should change a new one.
6.4 Feeding water equipment
During change shift, should start machine and check it to see whether all feeding water
equipments are in normal condition, if find any failure should repair it immediately.
